A STUDY OF WORKPIECE ROUNDNESS PROFILE FREQUENCY COMPONENTS IN CYLINDRICAL PLUNGE GRINDING

摘要

In cylindrical grinding processes, the generated chatter vibration could cause the loss of form and dimensional accuracy of ground workpieces. The effect of vibration induces the formation of lobes on the workpiece surface, which is usually detected using roundness measurement equipments. High precision parts with tight tolerance are in demand, which leads to the need of developing in-process roundness monitoring systems for cylindrical grinding processes. In grinding, most control strategies are based on the spindle power measurement but recently, the acoustic emission has been widely used for wheel wear and gap detection and thermal monitoring. This paper explores a potential use of the acoustic emission (AE) to detect workpiece lobes. This is achieved by sectioning and analysed the AE signal in frequency domain. Obtained results were validated against actual workpiece profile measurements. A comparative study showed that workpiece roundness frequency profile is distinguishable from the AE signal during grinding.